Synthesis and structural characterization of two cis-dioxorhenium(V) ReO_2[sn][p] MIXED-LIGAND COMPLEXES

摘要

Two novel five-coordinate cis-dioxorhenium(V) complexes of the general formula ReO_2[R_2NCH_2CH_2S][PPh_3] (R_2N = Et_2N, complex 1 and R_2N = (o-CH_3O-C_6H_4N(CH_2CH_2)_2N, complex 2) have been synthesized by reacting ReOCl_3(PPh_3)_2 with the respective bidentate ligands R_2NCH_2CH_2SH. The complexes have been characterized by elemental analysis, IR, NMR spectro-scopies and X-ray crystallography. X-ray crytallographic studies showed that the coordination geometry around rhenium is distorted trigonal bipyramidal. The basal plane is defined by the two doubly bonded oxygen atoms and the sulfur of the bidentate ligand, while the nitrogen of the ligand and the phosphorus occupy the apical positions.